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The CMS capabilities included in the VM/XA Migration Aid are provided only to
support installation, service, and conversion facilities for the migration aid. Full
CMS support can be obtained by executing VM/SP or VM/SP High Performance
Option as a V=R (or V=V) virtual machine.
The VM/XA Migration Aid supports the operation of one production V=R
preferred virtual machine in which DOS/VSE Release 3, OS/VSl with BPE
Release 3, or MYS/SP Version 1Release1.1 (or later releases) is operating and
one or more V = V test virtual machines in which MVS/XA and the preceding
operating systems are operating. In a 4381 uniprocessor configuration, the
VM/XA Migration Aid cannot allocate one instruction processor to the production
MYS/SP virtual machine and one instruction processor to the test MVS/XA
virtual machine(s) as is done in a 3081 processor, which has two instruction
processors. Therefore, running MYS/SP Version 1 production under the VM/XA
Migration Aid in a 4381 uniprocessor or configuration should be assessed carefully.
As of Release 2 of VM/XA Migration Aid, virtual machine support of operating
systems is as follows. DOS/VSE, OS/VSl, MYS/SP Version 1, MVS/XA,
VM/SP, or VM/SP High Performance Option (each operating in uniprocessor
mode) can execute in a V=R preferred virtual machine. DOS/VSE, OS/VSl,
MYS/SP Version 1, MVS/XA, VM/SP, VM/SP High Performance Option,
VM/XA Migration Aid, or VM/XA Migration Aid CMS (each operating in
uniprocessor mode) can execute in a V=V virtual machine. MVS/XA or VM/XA
Migration Aid operating in virtual MP mode can execute in a V = V virtual machine.
Facilities are also included to improve the performance of the production MYS/SP
Version 1 virtual machine, such as improved handling of its
1/0
using the dynamic
channel subsystem of System/370 extended architecture and automatic recovery of
the production virtual machine whenever possible after an abnormal termination
and automatic restart of the VM/XA Migration Aid occurs. The execution of all
virtual machines is initiated using the MVS/XA instruction START
INTERPRETIVE EXECUTION, and 31-bit addressing is supported for MVS/XA
virtual machines.
70:35 Virtual Machine/System Product-Entry
Virtual Machine/System Product Entry (VM/SP-Entry) supports 4381
uniprocessor model groups operating in System/370 mode with a minimum of 4Mb
of processor storage. VM/SP-Entry is a preconfigured system that provides
interactive, easy-to-install, load-and-go VM/SP entry-level support.
It
supports
CMS virtual machines and server virtual machines (such as RSCS and SQL/DS).
No other operating systems executing in a virtual machine are supported. A
maximum of 128 virtual machines (CMS only or CMS and server) can be active at
a time.
Section 70: Programming Systems Support
123
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